Xylem HandyLab 680 - Manual (Page 46)

Operation HandyLab 680
46 ba77041e01 03/2014
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owners protected by law.
Note
The buffers are selected in the menu, pH / <MENU/ENTER> / Calibra-
tion / Buffer (see section 4.7.3).
Calibration points Calibration can be performed using one to five buffer solutions in any
order (single-point to five-point calibration). The meter determines the
following values and calculates the calibration line as follows:
Note
You can display the slope in the units, mV/pH or % (see section 4.7.3).
Stability control The calibration procedure automatically activates the stability control
function. The current measurement with stability control can be termi-
nated at any time (accepting the current value).
Calibration record The new calibration values are displayed when a calibration procedure
23 Chemsolute * 2.000
4.000
7.000
10.000 20 °C
24
USABlueBook *
4.000
7.000
10.000 25 °C
25 YSI * 4.000
7.000
10.000 25 °C
No. Buffer set* pH values at
Determined
values Displayed calibration data
1-point Asy  Zero point = Asy
 Slope = Nernst slope
(-59.2 mV/pH at 25 °C)
2-point Asy
Slp.  Zero point = Asy
 Slope = Slp.
3-point to
5-point Asy
Slp.  Zero point = Asy
 Slope = Slp.
The calibration line is calculated
by linear regression.